First Order Analysis for Automotive Body Structure Design - Part 1: Overview and Applications

Nishigaki, Hidekazu; Amago, Tatsuyuki; Sugiura, Hideki; Kojima, Yoshio; Nishiwaki, Shinji; Kikuchi, Noboru

doi:10.4271/2004-01-1658

Cited by 7 publications

(4 citation statements)

References 6 publications

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“…Although CAD tools can be used in a similar or even more sophisticated manner, additional significant investments in money and time are usually required. Microsoft Excel facilitates the use of in-house tools since it offers a range of object-oriented functions, and it is easy to implement tools developed using visual basic applications [14].…”

Section: Basic Concepts Of Optimization For Supporting Conceptual Desmentioning

confidence: 99%

Concurrent Design and Evaluation Based on Structural Optimization using Structural and Function-oriented Elements at the Conceptual Design Phase

Takezawa¹,

Nishiwaki²,

Izui³

et al. 2005

Concurrent Engineering

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Computer-aided engineering (CAE) has been successfully used in mechanical industries such as automotive industries. CAE enables us to quantitatively evaluate the mechanical performances of products and to propose an effective way to improve their performances using optimization techniques without building physical prototypes. However, CAE tools are usually utilized not at the conceptual design phase, but at the evaluation phase following the detailed design phase. This is because current CAE tools require detailed design data that does not yet exist at the conceptual design phase, and such tools also inhibit the provision of useful design suggestions that, ideally, match the way of thinking and insight of design engineers. Thus, at present, no CAE tools exist that can assist the conceptual design decision making process of design engineers. On the other hand, conceptual design processes are of great significance when seeking to create innovative and high-performance products and to shorten their development time. In order to fulfill the designer’s needs during the conceptual design phase, a new type of CAE method must be constructed, one that enables concurrent design support and evaluation, and fits the way design engineers think and explore design insights. This article presents a new structural optimization method that supports concurrent decision making so that design engineers can work to obtain innovative designs and evaluate the mechanical design details of mechanical structures at the conceptual design phase. This method is developed based on the concept of product-oriented analysis and discrete, function-oriented elements, such as beam and panel elements, since these can provide design suggestions concerning the structural evaluation of reasons as to why certain design ideas obtained are reasonable or optimal in the design sense. The basic ideas and specifications needed to construct the method are explained and the construction of the structural optimization design method is discussed. The optimization algorithm is developed using the ground structure approach and CONLIN sequential convex programming. The examples provided demonstrate the utility of the proposed methodology for supporting design engineers’ concurrent decision making, so that innovative mechanical designs can be evaluated at the conceptual design phase.

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Section: Basic Concepts Of Optimization For Supporting Conceptual Desmentioning

confidence: 99%

Concurrent Design and Evaluation Based on Structural Optimization using Structural and Function-oriented Elements at the Conceptual Design Phase

Takezawa¹,

Nishiwaki²,

Izui³

et al. 2005

Concurrent Engineering

Self Cite

View full text Add to dashboard Cite

show abstract

“…To overcome these drawbacks, a new design approach, FOA (first order analysis), has been proposed by Nishigaki [4] and Yasuaki [6]. The FOA technique is a very quick and easy way of deciding and analyzing structures in a conceptual design phase.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the effects of main design parameters variation on the vibration characteristics of a vehicle sub-frame

et al. 2009

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In the design process of an automobile part, several analysis methods are usually used to evaluate the performance of the part. However, most automobile design engineers do not directly use CAE ( computer aided engineering) tools since specific skills are required to obtain practical results. Moreover, CAE requires a huge amount of computation time and cost. To resolve these problems, a new design approach, termed first order analysis (FOA), has been proposed. In this paper, the FOA technique is employed to design a vehicle sub-frame. An equivalent model of the vehicle subframe which only consists of beam elements is proposed and the modal properties obtained with the model are compared to those obtained with a full scale finite element model. The effects of some parameter variations on the modal characteristics of the vehicle sub-frame are investigated by employing the FOA equivalent model.

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“…Several specialized software tools have been developed to aid the BIW development phase. Toyota Central R&D Labs proposed a first-order analysis concept for the BIW designers and developed finite-element-analysis software which can give static stiffness, NVH (Noise, vibration, and harshness) and crashworthiness analyses [1][2][3][4][5]. Hou et al [6][7][8] developed an intelligent CAE system "ACD-ICAE" for auto-body concept design.…”

Section: Fig 1 the Biw Concept Modelmentioning

confidence: 99%

A Two-Level Cross-Sectional Optimization Approach for Automotive Body Concept Design

Qin

Liu

et al. 2018

Automot. Innov.

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Concept design is vital important in development of auto-body and it has great effects on later design work. In this paper, a twolevel cross-sectional optimization approach is presented to shorten concept design cycles. First, an exact structural analysis approach for spatial semi-rigid framed structures, i.e., the transfer stiffness matrix method proposed in our previous study, is adopted for both static and dynamic analyses of body-in-white (BIW) structure. A two-level cross-sectional optimization approach is then proposed for an automotive BIW lightweight design, and genetic algorithm is used to solve the optimization models. Afterward, an object-oriented MATLAB toolbox, using distributed parallel computing techniques, is developed to promote the concept design of the BIW structure. Finally, relevant numerical examples demonstrate the validity and accuracy of the proposed method.

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First Order Analysis for Automotive Body Structure Design - Part 1: Overview and Applications

Cited by 7 publications

References 6 publications

Concurrent Design and Evaluation Based on Structural Optimization using Structural and Function-oriented Elements at the Conceptual Design Phase

Concurrent Design and Evaluation Based on Structural Optimization using Structural and Function-oriented Elements at the Conceptual Design Phase

Analysis of the effects of main design parameters variation on the vibration characteristics of a vehicle sub-frame

A Two-Level Cross-Sectional Optimization Approach for Automotive Body Concept Design

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